For MacOS Maveriks (10.9 and perhaps later versions too), Apache Ant does not come bundled with the operating system and so must be installed manually. You can use brew to easily install ant. Simply execute the following command in a terminal window to install brew:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
It's a medium sized download which took me 10min to download and install. Just follow the process which involves installing various components. If you already have brew installed, make sure it's up to date by executing:
brew update
Once installed you can simply type:
brew install ant
Ant is now installed and available through the "ant" command in the terminal.
To test the installation, just type "ant -version
" into a terminal window. You should get the following output:
Apache Ant(TM) version X.X.X compiled on MONTH DAY YEAR
Source: Error executing command 'ant' on Mac OS X 10.9 Mavericks when building for Android with PhoneGap/Cordova
If you are getting errors installing Brew, try uninstalling first using the command:
rm -rf /usr/local/Cellar /usr/local/.git && brew cleanup
Thanks to OrangeDog and other users for providing additional information.